isNumeric               package:limma               R Documentation

_T_e_s_t _f_o_r _N_u_m_e_r_i_c _A_r_g_u_m_e_n_t

_D_e_s_c_r_i_p_t_i_o_n:

     Test whether argument is numeric or a data.frame with numeric
     columns.

_U_s_a_g_e:

     isNumeric(x)

_A_r_g_u_m_e_n_t_s:

       x: any object

_D_e_t_a_i_l_s:

     This function is used to check the validity of arguments for
     numeric functions. It is an attempt to emulate the behavior of
     internal generic math functions.

     'isNumeric' differs from 'is.numeric' in that data.frames with all
     columns numeric are accepted as numeric.

_V_a_l_u_e:

     'TRUE' or 'FALSE'

_A_u_t_h_o_r(_s):

     Gordon Smyth

_S_e_e _A_l_s_o:

     'is.numeric', 'Math'

_E_x_a_m_p_l_e_s:

     isNumeric(3)
     isNumeric("a")
     x <- data.frame(a=c(1,1),b=c(0,1))
     isNumeric(x)   # TRUE
     is.numeric(x)  # FALSE